Malicious PDF — malware analysis report

Static analysis result for SHA-256 c64dfc72c5772c11…

MALICIOUS

PDF

78.5 KB Created: 2021-03-26 06:40:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cef063add1f3eb8c4998a7f859b0b7e1 SHA-1: b9a57a6e000ee96a16494ce3b6b9699253e69e90 SHA-256: c64dfc72c5772c111979c653313742eaedb449184ebde068fb4ef42588ce98fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to suspicious domains like 'midufefew.ru' and 'vezerfa.xyz', suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://midufefew.ru/strik?utm_term=junie+b+jones+chapter+books+reading+level PDF link annotation
    • http://vezerfa.xyz/lamufeuefdj.pdfIn PDF document text
    • http://kudusakepupa.sportsontheweb.net/adenosis_esclerosante.pdfIn PDF document text
    • http://7evenrp.ru/tusekumtcs94.pdfIn PDF document text
    • http://shtangelkipokupkiitd.online/consumer_reports_used_car_guide_201806666.pdfIn PDF document text
    • http://lnstagramsecurity.net/moniciones_domingo_xxix_tiempo_ordinario_ciclo_cwdewq.pdfIn PDF document text
    • http://my-favshopf.online/82188681230eb076.pdfIn PDF document text
    • http://rukunikuxajosog.22web.org/62217546764.pdfIn PDF document text
    • http://mofobawosenej.mygamesonline.org/tuxibubuwubabatep.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/manual_prctico_de_psicoterapia814mg.pdfIn PDF document text
    • http://hesap-al-sat.com/bell_lets_talk_picture_framel4ctf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuxibuzejapise.epizy.com/zafira_wiper_blade_length.pdfIn PDF document text
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_2a286c68833e41ce900f9d8e6190268e.pdf?index=trueIn PDF document text
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_9a32694034f749b4bb742a9202c6d045.pdf?index=trueIn PDF document text
    • https://60b161a2-b511-46bc-b48c-7ca4331f2db3.filesusr.com/ugd/34b71b_9985567fb7bc4837bb1b4dcd7450828e.pdf?index=trueIn PDF document text
    • http://kepirodineloga.epizy.com/casio_mens_g_shock_mudman_watch_g9000ms1k.pdfIn PDF document text
    • http://wobadumiravolu.atwebpages.com/nivavomolawemopopumu.pdfIn PDF document text
    • http://saxarivoje.onlinewebshop.net/dbx_160_compressor.pdfIn PDF document text
    • http://faxiruvud.myartsonline.com/22901333301.pdfIn PDF document text
    • https://0aed7b51-d02b-4864-a6bb-b478bb809667.filesusr.com/ugd/fbdaab_d686beea04bf4d819bb5cf25a9e8234c.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C5 5664 bytes
SHA-256: 0b0acb2bda6d126fdfa7a09f271571dce1a98782f99ef76268f39d55bc57c206
font_01_sfnt_off00010905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10905 10824 bytes
SHA-256: 688bce2bd4606c2260333c983e76e6716d7418d857e4b56c603a562416750bb5

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